92 Fleetwood Bounder only starts with aux boost

enblethen wrote:
Yes the battery disconnects are the solenoids. The brown ones are the disconnects. the silver ones are the ignition and the charge relays.
No, you need to connect one lead (black) of meter to ground, connect the other (red) lead to a large terminal. Best to start with the lead going to battery. It should have the same voltage as battery. If it does go to the other large terminal. If solenoid contacts are closed you should have same voltage.
The brown relay are mechanically latching relays. The small terminals from the electronics have the 12 volt DC reversed to open and close.

Ok tested relays. Have two of them both labeled coach chassis. First one tested 12.6 on both large post. Second one tested 12.6 on left large post but nothing on right large post. Help me understand this and what this means. I should mention I have aux switch off and not sure on main battery since that is the issue.

Miked9606 wrote:

enblethen wrote:
Yes the battery disconnects are the solenoids. The brown ones are the disconnects. the silver ones are the ignition and the charge relays.
No, you need to connect one lead (black) of meter to ground, connect the other (red) lead to a large terminal. Best to start with the lead going to battery. It should have the same voltage as battery. If it does go to the other large terminal. If solenoid contacts are closed you should have same voltage.
The brown relay are mechanically latching relays. The small terminals from the electronics have the 12 volt DC reversed to open and close.

Ok tested relays. Have two of them both labeled coach chassis. First one tested 12.6 on both large post. Second one tested 12.6 on left large post but nothing on right large post. Help me understand this and what this means. I should mention I have aux switch off and not sure on main battery since that is the issue.

That’s exactly what mine look like but both are labeled coach.

Miked9606 wrote:

Miked9606 wrote:

enblethen wrote:
Yes the battery disconnects are the solenoids. The brown ones are the disconnects. the silver ones are the ignition and the charge relays.
No, you need to connect one lead (black) of meter to ground, connect the other (red) lead to a large terminal. Best to start with the lead going to battery. It should have the same voltage as battery. If it does go to the other large terminal. If solenoid contacts are closed you should have same voltage.
The brown relay are mechanically latching relays. The small terminals from the electronics have the 12 volt DC reversed to open and close.

Ok tested relays. Have two of them both labeled coach chassis. First one tested 12.6 on both large post. Second one tested 12.6 on left large post but nothing on right large post. Help me understand this and what this means. I should mention I have aux switch off and not sure on main battery since that is the issue.

That’s exactly what mine look like but both are labeled coach.

Quick update. Please confirm my thoughts. Put meter neg on bolt on chassis that is grounding 12v starter battery, + to bat + and am getting reading of about 6. Bad ground causing my problem? Since my bat measures correct, cells measure correct. Thoughts?

The second one is not making contact. It could be bad control, bad connections, or bad contacts.
The 6 volt reading could be missed wiring on batteries if you have two six volt batteries. Common for Fleetwood to use two six volt batteries for the coach system. If you have 6 volter, the positive of one goes to the negative of the other. Then positive of the empty one goes to disconnect while the negative of the other goes to ground.
Yes it could be a bad connection, but on either the positive or negative.

enblethen wrote:
The second one is not making contact. It could be bad control, bad connections, or bad contacts.
The 6 volt reading could be missed wiring on batteries if you have two six volt batteries. Common for Fleetwood to use two six volt batteries for the coach system. If you have 6 volter, the positive of one goes to the negative of the other. Then positive of the empty one goes to disconnect while the negative of the other goes to ground.
Yes it could be a bad connection, but on either the positive or negative.

Further testing. The second one must be my aux. turned aux switch in and have same on right post now. Also took ground off of chassis and battery and cleaned it up. Reading 11.5 on meter when I go from chassis ground to bat +. Still no lights or start. Going to pull + and clean that. Any other ideas?

Look around the chassis battery for a large wire that goes to the Ford starter relay on the fire wall. Fords have a different starting system then my Chev chassis. Fords have a starter relay and some have a starter solenoid as well.
My rig has large power cable to the starter solenoid mounted on it. Fords wire through a starter relay. My starter power does not go through the disconnect.
Make sure your chassis battery has good ground.
Locate starter relay. Verify that there is 12 volts from the battery.
When energizing the aux start, the starter power goes through the relay in the battery control center. This provides a separate path to get to starter relay.

enblethen wrote:
Look around the chassis battery for a large wire that goes to the Ford starter relay on the fire wall. Fords have a different starting system then my Chev chassis. Fords have a starter relay and some have a starter solenoid as well.
My rig has large power cable to the starter solenoid mounted on it. Fords wire through a starter relay. My starter power does not go through the disconnect.
Make sure your chassis battery has good ground.
Locate starter relay. Verify that there is 12 volts from the battery.
When energizing the aux start, the starter power goes through the relay in the battery control center. This provides a separate path to get to starter relay.

From bat it goes to starter solenoid. Getting 11.97 on solenoid.

That sounds like not getting control (ignition) power from chassis battery
In the battery control center, look for a circuit breaker fed from the chassis battery.
do you see amodel number of the battery control center?

enblethen wrote:
That sounds like not getting control (ignition) power from chassis battery
In the battery control center, look for a circuit breaker fed from the chassis battery.
do you see amodel number of the battery control center?

See link for breaker style. https://g.co/kgs/bqeT2S

I see a pt number 4165 Phillips product

Miked9606 wrote:


From bat it goes to starter solenoid. Getting 11.97 on solenoid.

11.97 means EITHER a dead battery or significant resistance somewhere between battery and starter solenoid.

What is battery voltage (positive terminal of battery to negative terminal of battery)?

The two should be exactly the same when no load/starter not engaged.